I think some of it has to do with the fact that Tangiers has the the molasses baked into the tobacco. This is the reason why it smokes so long. And the noir line has a more nicotine than most hookah tobaccos and nicotine is extremely hydrophilic - meaning it loves absorbing moisture. Those are the two things that really set the Noir line apart from others so I would guess it has something to do with one of these. And as far as packaging Eric has said that it isn't vacuumed sealed but the tobacco is still warm when it goes in so cooling makes it appear that it is.